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Fix collaboration replay so selection deletes complete before replay advances, protect SVG shell elements from malformed deletes, and discard deleted Pencil overlays without scanning batches while idle.
Allow unrelated boards to save concurrently while preserving same-board write ordering. Honor forwarded HTTP metadata only for configured proxies, including custom client-IP header sources. Share DOM-free tool contracts between server and browser code while keeping the initial viewport independent of tool implementations.
Validated together with 413 Node tests, 68 Chromium tests, lint, typecheck, and the full benchmark suite. CI also checks Node 22 and 24.